HVDC & FACTS (EX-702 (B)) - Important Questions

What are FACTS controllers and explain/discuss the different types/categories with examples

Explain the flow of power in AC parallel paths and meshed systems.

Explain the principle of reactive power control in electrical power transmission?

What is the principle of conventional reactive power compensators?

Explain what SSSC is, its uses, operation and basic operating control schemes with a suitable diagram.

What is a STATCOM? Explain its construction and working/operation for reactive power compensation.

Explain the objectives and methods of controllable VAR generation.

Explain with a neat block diagram general control scheme of Static VAR Compensator (SVC).

Explain the power angle characteristics of a series-compensated line and show how compensation affects the power transfer limit?

Discuss TCSC in detail with their advantages and disadvantages.

Explain the working principle and characteristics of the Interline Power Flow Controller (IPFC) with a suitable diagram.

Explain how active power filters provide harmonic current (and reactive power) compensation and its significance

Write short note on Unified Power Flow Controller (UPFC).

With a neat diagram, explain the construction, operating principle, and control of the Unified Power Flow Controller (UPFC).

Draw the schematic diagram of Unified Power Flow Controller (UPFC).

Explain the equivalent circuit representation of rectifier and inverter configurations in HVDC systems.

Draw the layout/schematic diagram of an HVDC converter station and discuss the various equipments/apparatus and purpose of each.

Explain the applications of HVDC / DC transmission system

Describe the inverter operation in HVDC systems.

Explain the analysis of bridge converters with and without overlap.

Derive the expressions for input power, output power and power factor of a 12-pulse bridge converter with delay angle $\alpha$ assuming no overlap.

Explain the merits and demerits of HVDC transmission system

Write short notes on any two:

Compare series and parallel MTDC systems in terms of operation, control and reliability.

Discuss and compare AC filters and DC filters in HVDC systems.

Explain the principle of control of HVDC system.

Explain the concept of firing (ignition) angle control in an HVDC converter station.

Write short notes on any two of: current and extinction angle control, power angle control with series compensation, SSSC principle and control, ignition angle control.

Explain the power reversal in HVDC systems and how is it achieved?

Explain the Voltage Source Converter (VSC)-based HVDC system?

Explain multiterminal DC systems and their applications.

Draw the converter control characteristics.

Discuss the types of harmonics in HVDC systems.